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Study calculates Vitamin D requirement for dark-skinned subject living in Chicago as 2500 IU/day |
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EurekAlert: African-American men have lower levels of Vitamin D because the increased melanin in darker skin blocks the ultraviolet rays necessary for the body to produce the vitamin, Murphy said. Thus, African-American men require up to six times more sun exposure than Caucasian men to make adequate Vitamin D levels. "It takes a dark-skinned male like myself 90 minutes three times a week to absorb enough sunlight to produce the recommended amount of Vitamin D compared to just 15 minutes three times a week for a Caucasian male," said the Chicago-based Murphy, who also is a physician at Jesse Brown VA Medical Center.
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